I am a non-EU person living and working in Germany. I completed my Masters from a German university in three years and then I started working with a Blue Card with a company in Munich. After six months, I quit and went to Belgium to study and then returned to Germany for a job. Since October 2021, I have been working in Germany on a new Blue Card. I speak German at a B2-C1 level.
I am wondering if I am eligible for a Niederlassungserlaubnis now? I have checked all the requirements and the only doubt I had was that, as a Blue Card holder and speaking German at a B2-C1 level, I become eligible after 21 months. In my case, do the six months I worked (on the old Blue Card) before I went to Belgium count towards the 21 months? If so, then I think I could apply by the end of January 2023.
I also read in the German law that study time counts, though only half, so for me it would be 1.5 years - would this be counted too? Any insight would be helpful. I have read a lot but I am still unsure. I have written many emails to the Foreigner's office but I have not received a reply.