Grafana Username issues with employee accounts

We are migrating from hosted grafana to cloud. We are are running into issues where some of our employees have personal accounts already with the username pattern that we use for email addresses so we can’t have a standard username across the enterprise.

How do others handle that? It seems odd to have to have users like firstlast2. It also seems odd that cloud usernames are restricted to alphanumeric characters.

Usually you have own identity provider and then you will use SSO protocols (OIDC, SAML) in apps (e. g. Grafana Cloud). You manage users and security (e. g MFA, password policy,…) in single place - in your IDP.