I joined a German Company dated 01 July 2016. I was sent to Mexico , by my German Company dated 1 April 2018. The project comes to an end and i have to move back to work in the same company to Germany . While exiting Germany , the Foreigners office told me that if I want to keep the Blue card valid , I have to visit Germany every 1 year. Additionally i can also take the Certificate 51. Certificate 51 allows you to leave the country for more than 1 year, keeping your blue card valid.
1)Is there a way to check the validity of the Germany Blue card (Blue card Sticker says 30 June 2020)? 2)I was visiting every year in the meantime . My last travel was for a week to Munich ending 07 June. Based on the 12 month rule. I can still travel till 06th June 2020. Frankfurt Police has confirmed me the same. 3) The certificate 51 expired dated 26 03 2020 . And now Foreigners office says that since you were not back before 26032020, the Blue card has expired. It was not possible to travel because of Covid. I have already given the cancelled tickets to them. The Foreigners office is giving only importance to certificate 51, and not to one year Blue card Rule.
Please help in this case , what is more important 1 year Blue card Expiry Date of Certificate 51 ? Where can I read detailed rules for this ? The Social Security is still running in Germany from 1 July 2016. Thanks