Error - is down for maintenance. Please try again later

Hi there!
A couple of weeks ago, I installed SC2 on my new computer (Windows11). The launcher starts normally, also logging me in with my Blizzard-account. But when trying to start the game, I keep getting a message “Cant connect to Blizzard services”.
I then log in with my password and keep getting a message saying “Error - is down for maintenance. Please try again later.” This is, while the friends I want to play with have no problems starting the game themselves.
I troubleshooted possible connectivity problems or security programs preventing the connection and cleared the - cache, but to no avail.
This problem keeps persisting, now already several weeks. Could you help me with this? Thank you in advance!

UPDATE: SOLVED! This post was the solution to my problem: Can't connect to services