I am running a few forums with a facebook login possibility. In the last years this was working very well without any problem. Since yesterday some users told me, that they could not login anymore with the smartphone device.
I tested this with the chrome browser on my PC and it was possible to login without an error. Then I used my smartphone and my tablet (Android) to login and indeed, there comes the error up from the subject.
Then I tried to simulate this with chrome. I switched to the chrome user agent switcher and gave me the android user agent. I tried it again with chrome but still the login is working.
Then I move on my smartphone browser to the Desktop View (Chrome and Android Browser) and tried to login, still not possible.
I cleared the cache on my Computer and I tried it with firefox on my computer. Its always the same:
The Login is working on my computer. The login is not working on a smartphone or tablet device.
I have not changend anything on my site.
Invalid Request / The provider_connection_token does not exist or has not been specified
Do you have any hint?
Thank you so much.
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