HI Daniel,
I cannot confirm your assumption, that this issue is related to a case sensitive "userid".
I always log in to SOI in the same way (all digits in lower case) and sometimes I get the same error as mentioned in the initial question. Most times, another try is successful. However we have several users mentioning this issue.
MichaelBoehm: We have this issue now for about two months in customer environment. It occurs after entering the credentials in the login prompt, once the OC console was started via SOI Admin dashboard.
BR,
Rene