NBSSLWebClient fails on AmazonRootCA1

Hardware MKR Family MKRNB1500
1

In the NBSSLWebClient example I turned on debug mode and recogniced that it only fails on AmazonRootCA1 and also later on arduino.cc. Any suggestion?
I have already updatedet the version.

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AT+USECMNG=0,0,"Go_Daddy_Root_Certificate_Authority_G2",969

>
+USECMNG: 0,0,"Go_Daddy_Root_Certificate_Authority_G2","803ABC22C1E6FB8D9B3B274A321B9A01"

OK
AT+USECMNG=0,0,"VeriSign_Class_3_Public_Primary_Certification_Authority_G5",1239

>
+USECMNG: 0,0,"VeriSign_Class_3_Public_Primary_Certification_Authority_G5","CB17E431673EE209FE455793F30AFA1C"

OK
AT+USECMNG=2,0,"AmazonRootCA1"

ERROR
AT+USECMNG=0,0,"Starfield_Services_Root_Certificate_Authority_G2",1011

>
+USECMNG: 0,0,"Starfield_Services_Root_Certificate_Authority_G2","173574AF7B611CEBF4F93CE2EE40F9A2"

OK
AT+USOCR=6

+USOCR: 0

OK
AT+USOSEC=0,1,0

OK
AT+USECPRF=0,0,1

OK
AT+USOCO=0,"arduino.cc",443

ERROR

+UUSOCL: 0
AT+USOCL=0

ERROR
connection failed
AT+USOER

+USOER: 9

OK

disconnecting.
2

Is SSL for arduino.cc issued by AmazonRootCA1?

3

I just tried it a few days later and it worked. No idea what I had wrong.

4

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