Hi Konstantin,
They changed it to be under Credentials. Below is link to list of your certifications:
https://learn.microsoft.com/en-us/users/me/credentials/certifications?tab=credentials-tab
Officially it can take up to 48 hours after exam for certification to show up, but in my experience it only takes couple of hours. Please note to earn Azure Solutions Architect Expert certification you need to have Active Azure Administrator Associate certification (AZ-104) in addition to passing AZ-305 exam.
Please click Accept Answer if above was useful.
Thanks.
-TP