Software Interrupt : TimerOne library issue with Arduino nano EVERY

Hello,
I would like to display the Time independently of what the rest of my program is doing. As I am fairly new to arduino and coding, my research led me to the magical world of Interrupts. After some tutorials and articles I now have a basic understanding of the subject.
I found this library : GitHub - PaulStoffregen/TimerOne: TimerOne Library with optimization and expanded hardware support, which should allow me do use a Timer (ex :Timer1) and come up with something like that :

void Setup(){
Timer1.initialize(1000000);
Timer1.attachInterrupt(UpdateTime);
}
void UpdateTime(){
Serial.println(Time blablabla...);
}

I tried to compile the library : #include <TimerOne.h>, but I am getting this error : [This is an extract of the entire error message]

Arduino: 1.8.12 (Windows 7), Board: "Arduino Nano Every, None (ATMEGA4809)"

WARNING: library TimerOne-master claims to run on avr architecture(s) and may be incompatible with your current board which runs on megaavr architecture(s).
In file included from C:\Users\HOMEST~1\AppData\Local\Temp\arduino_modified_sketch_464418\sketch_apr12a.ino:1:0:

C:\Users\HomeStudio\Documents\Arduino\libraries\TimerOne-master/TimerOne.h: In member function 'void TimerOne::initialize(long unsigned int)':

C:\Users\HomeStudio\Documents\Arduino\libraries\TimerOne-master/TimerOne.h:184:2: error: 'TCCR1B' was not declared in this scope

  TCCR1B = _BV(WGM13);        // set mode as phase and frequency correct pwm, stop the timer

  ^~~~~~

C:\Users\HomeStudio\Documents\Arduino\libraries\TimerOne-master/TimerOne.h:184:2: note: suggested alternative: 'TCB1'

  TCCR1B = _BV(WGM13);        // set mode as phase and frequency correct pwm, stop the timer

  ^~~~~~

  TCB1

In file included from c:\users\homestudio\appdata\local\arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino5\avr\include\avr\io.h:99:0,

                 from c:\users\homestudio\appdata\local\arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino5\avr\include\avr\pgmspace.h:90,

                 from C:\Users\HomeStudio\AppData\Local\Arduino15\packages\arduino\hardware\megaavr\1.8.5\cores\arduino/api/String.h:30,

                 from C:\Users\HomeStudio\AppData\Local\Arduino15\packages\arduino\hardware\megaavr\1.8.5\cores\arduino/api/Print.h:24,

                 from C:\Users\HomeStudio\AppData\Local\Arduino15\packages\arduino\hardware\megaavr\1.8.5\cores\arduino/api/Stream.h:25,

                 from C:\Users\HomeStudio\AppData\Local\Arduino15\packages\arduino\hardware\megaavr\1.8.5\cores\arduino/api/Client.h:22,

                 from C:\Users\HomeStudio\AppData\Local\Arduino15\packages\arduino\hardware\megaavr\1.8.5\cores\arduino/api/ArduinoAPI.h:29,

                 from C:\Users\HomeStudio\AppData\Local\Arduino15\packages\arduino\hardware\megaavr\1.8.5\cores\arduino/Arduino.h:23,

                 from sketch\sketch_apr12a.ino.cpp:1:

C:\Users\HomeStudio\Documents\Arduino\libraries\TimerOne-master/TimerOne.h:184:15: error: 'WGM13' was not declared in this scope

  TCCR1B = _BV(WGM13);        // set mode as phase and frequency correct pwm, stop the timer

               ^

In file included from C:\Users\HOMEST~1\AppData\Local\Temp\arduino_modified_sketch_464418\sketch_apr12a.ino:1:0:

C:\Users\HomeStudio\Documents\Arduino\libraries\TimerOne-master/TimerOne.h:185:2: error: 'TCCR1A' was not declared in this scope

  TCCR1A = 0;                 // clear control register A

  ^~~~~~

C:\Users\HomeStudio\Documents\Arduino\libraries\TimerOne-master/TimerOne.h:185:2: note: suggested alternative: 'TCB1'

  TCCR1A = 0;                 // clear control register A

  ^~~~~~

[PART OF THE ERROR MESSAGE REMOVED HERE]

exit status 1
Error compiling for board Arduino Nano Every.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

2 questions :
-What does the error mean and can I fix it ?
-I have seen that using a Serial request during an interrupt is not recommanded, so does anyone has a better approach to have the time displayed every second in an independent way ?

I checked the "Show verbose output during compilation" box but the error message is too long to be paste here and I don't know which part is relevant.
Thanks for your help !

Are you sure that library supports the ATMega4809 chip in the Nano Every?

No I'm not. I get the same result with the ATMEGA328 emulation, not sure if this is relevant.

Do you know an other one ?

If all you need is a 1-second update, a hardware timer and interrupts is probably the wrong way to go. Especially considering the hidden traps using interrupts holds for newbies. Just use the millis() technique and do it as part of your loop() function.

The millis() technique works well as long as I come back in the loop() without delay.

I already tried something like that :

void loop()
{
  TimeClockB = millis() - TimeClockA; // TimeClockA is = millis() in setup()
  if (TimeClockB >= 1000) // 1000 = 1 second
  {
    TimeHour(); // This procedure displays the time every second
    TimeClockA = millis();
  }
  
  RotaryEncoder();
  if (key != 0)
  {
    switch (key)
    {
      case blablabla:
      DO STUFF
      break;
     }
  }
}

The problem is there are other loops within my Swith Case structure, sometimes with some delay() before it comes back in the loop(). That's why I was looking for another solution. Setting an interrupt every second looked like a clean and convenient one.
A solution is to put the millis() timing comparision in every loops but I don't really like it cause it will complexify futur code troubleshooting.