In the the communication between a network-access-server (short: nas) aka "your mikrotik hotspot __and__ a radius-server aka "your user-manager" (maybe both functions on the same device), are two different communication-channels defined. One for authentication and one for accounting.
Obviously the authentication is working for you BUT accounting ... failed.
So you should search in your configuration for that accounting-part. It has to be enabled. (the pic is only an example ... inside your hotsspot config, you should be able to find a similiar item.
... ... something like "send interim update" ? ... enable that tickbox ! ... for further debug post an:
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