Building an 0.69 inch OLED module: Why is it not working?

Other Hardware Displays
1

I wanted to include a 0.69 inch OLED display into a project.
I ordered one of those modules that already have the resistors and capacitors included and tried it with my ATtiny814. It worked nicely.
Then I wanted to use the display directly without the module PCB. So I rebuilt the schematic of the Datasheet and ordered the project. Unfortunately, even though I used the same code as with the finished module, I get no output.
I then measured the voltage pins of the display with a voltmeter and got all the right voltages at the right place. Still, I do not get any output. I rechecked the schematics a couple of times and then ordered another display which I replaced the old with. Unfortunately, still no output. The same controller works with the finished module though.

I seem to have some mistake in my schematics. Does anyone here have some experience with such displays and could tell me what I did wrong?

Here is the code I am using:

#include <Tiny4kOLED.h>
// ============================================================================

void setup() {
  // put your setup code here, to run once:

  // This example is for a 128x64 screen
  oled.begin(128, 64, sizeof(tiny4koled_init_128x64br), tiny4koled_init_128x64br);

  oled.clear();
  normalSize();
  oled.on();
}

void loop() {
  delay(10000);
}

void normalSize() {
  //oled.setFont(FONT6X8P); // Kleine Schrift
  oled.setFont(FONT8X16P); // Grosse Schrift
  oled.setCursor(5, 2);
  oled.print("Normal Size Text");


}
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