Hi @Alexandr Ponomarenko , can you follow this document to see if it helps you? As well as this one:
For the external organizations listed under Other organizations you collaborate with, you might not be able to leave on your own, for example when:
- the organization you want to leave doesn’t allow users to leave by themselves
- your account has been disabled
Please let me know if the solutions work. If not I can help you further.
If this answer helped you please mark it as "Verified" so other users can reference it.
Thank you,
James