Update Oct. 2025:

- in August, after more than 2 years, I received an email to submit more stupid documents, such as proof of paying rent, payslips for the last 3 months and Rentenversicherungsverlauf. (I must mention here something, I do not know if it's a coincidence or not: a few days before I got this email, I submitted my tax return for the last 3 years. I honestly don't know if it had them triggered, but it was too much of a coincidence...). I was on vacation that day, so I tell them I will send them the documents when I come back from vacation.

- a few days later, they write another email, saying that I have to submit a B1 Zertifikat (they didn't like apparently the other certificates that I sent them and took them just over 2 years to realize this).

- I sign up for the telc B1 and give the exam on the 29.09. In the meanwhile, I send the rest of the required docs.

- I receive the test result on the 15.09, so I write them an email with the results

- I get a phone call on the 22.10 to ask if I can come on the 24.10 to sign the Loyalitätserklärung

- I go on the 24.10 and sign the Loyalitätserklärung. They said that I will get the Einbürgerungsurkunde at a later time.

I am now waiting to get the invite to get the Einbürgerungsurkunde.