500 invalid request code=4

"500 invalid request code=4" means Poweramp can't get reliable connection to Poweramp authorization server and the request from your device is modified somewhere in the middle.

This can be:
- bad connection - packets truncated (please try another wifi connection)
- you're behind some router which requires authorization and redirects to some login web page (please try to open anything in mobile browser first)
- you're behind some firewall/router which modifies http/https content and inserts e.g. ads in it (please try another wifi connection)

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