Hi @t.dewa
Welcome to the Auth0 Community!
I understand that you are looking for details on the most suitable Subscription Plan, as you will be having around 25,000 Monthly Active Users ( MAU ), which is the limit for the Free plan.
Official expected behaviour
If you opt for a Free tenant and you reach the limit of 25k MAU, the following can be expected to happen:
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tenant Admins will be notified via email and will receive warnings that the MAU limit has been exceeded, which are reflected for the previous month, please see Auth0 Quota Exceeded;
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users will not be logged out if the limit is exceeded;
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service disruptions if the limit is exceeded over a couple of months;
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new user creation should not be interrupted, however logins past the 25k mark will lead to getting blocked.
Recommended solution
Exceeding by a small amount and not regularly will not lead to any instant blockage, as the main objective would be to observe patterns and provide solutions to accommodate a larger number of users. If however your 25k MAU traffic expectation hold true and you start encountering problems with your tenant, I highly recommend getting in contact with our specialized Sales team to determine the best course of action for your particular use-case.
Hope this helped!
Have a graet one,
Gerald