World of EUC

just updated a German Server 2019 to 2601 CU1
Log is full of errors and profiles are not dismounted.

```[07:09:54.068][tid:0000122c.00000370][ERROR:00000057]  Failed to query activity id for session 2 (Falscher Parameter.)```
found some users on reddit with the same issue..

Hello <@UMCH8SMQB>.

any impact for the user? For example, profiles aren't detached properly?

exactly. All profiles were not detached. Rolled back to 2509.

<@UMCH8SMQB> it looks like i am also seeing this issue but only for ODFC containers, is that also your case?

hmm seeing the exact errors ion the profile logs but an end-user is noticing the issues on the ODFC container (outlook not responding, crashing). After a ODFC profiel reset everything is working again.

We are seeing the exact same issue with 2601. We use both profile and odfc for this customer.
Plan now is to revert to 2509, stop using odfc and then upgrade to 2601 CU1