This error most often occurs when there is an issue in communication between Spotipo RADIUS server and MikroTik Access point. Here are the easiest steps to take, to confirm that everything is set up correctly.

Log in to your APs Winbox and check the RADIUS settings. check that RADIUS server IP address is set as 34.77.150.10.
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Check that the secret is the same as the one generated in Spotipo (on spotipo website, go to Settings -> Mikrotik APs and copy the secret listed in the "Secret" section) .
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Make sure that the rest of the RADIUS Server settings are set as pictured below.

If everything was set up correctly in the first step, next common mistake is not turning on RADIUS authentication when setting up Hotspot.

To fix this, in winbox, navigate to IP->Hotspot and under Server Profiles select the profile that is used by your hotspot (Default name of new hotspot is hsprof1).

Once, you've selected the correct hotspot, navigate to RADIUS section. Make sure that check box Use RADIUS is selected. Also make sure that Accounting is turned on. Settings should be as pictured below.

After you've checked that everything was in order, feel free to test the connection out once again. With this setup, everything should work from our end.

If this article didn't help you solve your problem, please check if there were some configuration changes on your end. One common example is Firewalls blocking communication between our RADIUS server and your AP.

If there is still an issue, feel free to reach out to our support team, and we will help you out.