Hi everyone,
I managed to solve my issue by switching to the password-realm grant type and including the realm parameter in the request. This allowed me to specify the connection dynamically, which works perfectly for my use case.
password-realm
realm
Thanks for the resources and support!
https://auth0.com/docs/get-started/authentication-and-authorization-flow/resource-owner-password-flow/call-your-api-using-resource-owner-password-flow#configure-realm-support