New O2 esim with contract - verification not possible

Hello, 

I have been residing in Nuremeberg since 2 years now and I already have a mobile contract with another provider. I now want to switch to an O2 contract but I am unable to verify my identity. 

I have an active Indian passport. I had a valid resident permit but it expired in 2025, and Nuremberg office has given me a F iktionsbescheinigung until 2027. I have tried to ask them to fast the process but they only say “we have given a temp. visa document until 2027, so you will get the permanent one before then ”.

Unfortunately for me, I am not able to identify myself to but this new esim contract !!! I read from other posts that going to Deutsche post might not be helpful as their software is outdated and wouldnt recognize my passport or  fiction certificate. How should I proceed in this case?

I have 10 more days to finalize my contract, otherwise it would be cancelled.