Hi @mmbb110
If you are trying to login to Analytics via Experience Cloud (using either "Personal Account" or "School or Company Account" option), then your ID is your email address that is used to setup your account in Experience Cloud.
You can reach out to System Admin Users (not Analytics Product Admin) within your organization, who can access Admin Console and let you know the email address your account is setup with.
Additionally, when a system admin user sets you up in Experience Cloud (via Admin Console) you receive few welcome emails from Adobe, on the email address that is used for your account.
Let me know if this helps or if you are looking for any other information on account ID.
Thanks,
Saumya