Getting user account does not exist in tenant while trying to open account of a databricks workspace

Question

Hi I'm new to Azure AD and Unity catalog section.

I have a free tier subscription on my personal account. Though I have created the databricks workspace in Premium Tier as instructed but I cannot find manage accounts in databricks menu from top right drop down. Even my cluster is showing Unity catalog is enabled. So I directly tried to open accounts.azuredatabricks.net for unity catalog. But while singing in using the same account I got the following error:

Selected user account does not exist in tenant 'Microsoft Services' and cannot access the application '5gg814f7-4456-4ac6-77cb-cd0e5h879r3d' in that tenant. The account needs to be added as an external user in the tenant first. Please use a different account.

I'm the owner of this account and I checked my role assigments which is Global Administrator but still cannot log in.

Please let me know how to fix this. thanks in advance.