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Hey @NicklasWallgren I just started getting this same response on ALL checkChallenge and verifyChallenge requests. Nothing in my code has changed at all, but today it started throwing that error...
Looks like pogodev is working on fixes for other API's. Niantic is now validating Platform_Requests on login. 
Additional notes from Leah. > almost all API's don't send it on request 1 without it, you don't get an endpoint > the very first request now requires unknown6 to...
@NicklasWallgren I don't believe it actually has to be valid. Many of the API's are still using 0.45 api without hash server, so I'm assuming they aren't passing completely valid...
0.45 is officially dead. (uk25 value for 0.45 is no longer valid as of today) However api calls utilizing uk25 value for >0.45 to 0.57.2 still work even with completely...