Hi @hellodeep
Welcome to the Auth0 Community!
Yes, the free tier of Auth0 comes with 25k MAU.
Regarding how MAUs are calculated, I would advise you to review the following posts:
- What is Counted as Monthly Active Users (MAU)
- Understanding Monthly Active Users
- Regarding free plan, MAU vs users?
Basically, a one since MAU is regarded to the unique user ID which has been granted a token to access an application. Regardless of how many tokens an user is issued during the month, it is still being regarded as one. However, keep in mind that if an user authenticates with a different identity (passwordless//emails+password//social login) each identity will count as an additional MAU. You may want to look into account linking on that matter. All this information is available in the above links.
Hope this helps! If you have any other questions, feel free to leave a reply!
Kind Regards,
Nik