Grafana SAML Integration with Azure AD - 'user already exists' error

We’re running Grafana Enterprise version 8.4.9 and reference documentation SAML Authentication | Grafana documentation and Configure SAML authentication in Grafana | Grafana documentation.

We’re working on implementing Grafana SSO using SAML with Azure AD and keep encountering an user already exists error in the Grafana logs while the UI displays {"message":"Failed to save the SAML received information"}

We even manually removing the user via Grafana UI and then tried to log in using SAML SSO. It works the first time but fails when the same user tries to log on again with the same user already exists error. It seems to always be trying to create a new user.

Can anyone help on determine why this is occurring?