Unable to accept Provider invitation if the invitee needs to use SSO for login

Steps To Reproduce

1. Invite an account, that is a member of an organization with SSO enabled and enforced, as Service User/Admin
2. Accept the invitation by logging in via SSO

Expected Result

Invitation is accepted

Actual Result

Invitation is not accepted

Screenshots or Videos

No response

Additional Context

No response

Build Version

2026.8.1

Environment

Cloud (bitwarden.com)

Environment Details

No response

Issue Tracking Info

• I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.