Facebook login suddenly stopped working “Authentication failed! Facebook returned an invalid user id.”

We had a working FB login integration done via hybridauth version 2.7 for a php2 website and it suddenly started giving the error:

Authentication failed! Facebook returned an invalid user id.

Tried many things: application was not in sandbox, EU-Duprian – MU Legend Zen Adidas Zx 750 Homme Nike Air Force 1 homme Nike Air Max 98 Femme New Balance 1300 femme adidas hamburg homme asics gel nimbus 14 femme asics gel lyte v femme nike dynamo free td adidas stan smith enfants Nike Air Max 98 Homme Milwaukee Bucks fjällräven kånken Stora nike air max tn hombre nike air max 1 87 essential Mochilas Fjallraven Kanken Canotte Boston Celtics

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