Hi,I’ve set up SAML2 SSO with Authentik
The login works: Authentik accepts credentials, redirects back to ProjeQtOr with a valid SAML response.
But then… I just get a blank white screen.

With this url:

 https://projeqtor.terensys.fr/sso/projeqtor/index.php?acs?SAMLResponse=xVZtb9s2EP4rhvY5EvVCSRQSb1myFQHapEiCftiXgiJPMVtL1EgKTvfrd5QtJ3btrNv6AhgweHc8Pvfcm04tb5d9dQu2152F2WO77Gw1Cs%2BCwXSV5lbZquMt2MqJ6u78zesqCUnVG%2B200Mvg2ZWXb3BrwTilu%2BmKtGfBwrm%2BiqLVahWu0lCbhyghhESERWgjrXr4abJu5cvuW3Bccscn%2B0foxBH%2FcUQy7x8t0P07MBZRnQXoJZhdWTvAVWcd7xyKSEJPSHESF%2FcxqbK4SugfwewSrFMdd%2BOtzQvIxwf402kTOjDQ2U82bExkrX7SRKqT8Bj2i%2F5nLiw%2BdXkWvM%2BlSKVMWF6WRVazjJEyF2mcpowQXnOPqJuyc6%2FPgpvr317fvLq6ft8wBrmghJaJkEWa8bKsM0hLWcSSlA1FPaHQ1MH81OemGgMzcw%2FXIl4%2BuAV0Tn3cwcv7fqnEGFnkbz2BPxmPE8khsncaPfd7ui6kO8fdYHdPF1rC7B1fDvByBu1oXd0NQoC1QTRfv7DrtDqfymg%2FcSObRVzQjFJkkWQZLcuSUVnWIs8ZzWsef1F%2BvyNhGGz9AYTbnK6Rk6vL2e%2FatNwdJysO41Gi5EkzmlZDZ3sQqlEgg3kmylTwpOZJWecphViIWhY08WUmZVwwkTMSp4kQopR1lqWsSGQmQYpE0CZJNzjXYHZxXuiuUf5Fz%2F8bcAv9D10p2qoGbsAExx1dIj%2F%2Fu8pn19rddDfmvMH0fJbYfN24t8hRr8Bn%2Fj%2B37VSWhyLZU21CRgupvNp6kL8C5gz2EaYbhF8QxdQHg8RIBCBtziixfn5HM%2F8XMW7rFMPcBLF1s3feeTDai3ALwS0637bQItuz8Xio6QirYlalGUZ%2Bhz2PHq482WgjWUNpIQVhQkjJChbTmDZlJoqcFXlRJjnIMi5J2kCREix1WRBJ45gSBkQ0W3%2BHCGUnMf2830eQGImDR3dAdLHEBXYLzfzFHScq4e1Q%2FBb%2FVtrIt7gosRZA3huOXaqN2%2FJ5wPkB3Y5sy%2BmE0GEu6sHBUcXM9%2FG23q1YQMtt%2BKCf5pnSuBQTXIrJeoQNSgb7XsbxPc8nKLvifelXgIAz3rN7BAf%2FyGWruq%2BJplXCaKsbFwrdRivrvxPKiOSRkh6i%2BxRhYlVroxWOA72yXAg9dO77gsQlYjXvx%2B%2BYDZxXRg%2F9MQQTv7Nzj8R%2BKyhrtmiEv3220FYtuZTGb%2FTDKP9CKhfcKAhrn3Qjf3k2pn4A5JdSuiX0Eho%2BLN2a2B8Acui7b0lndHS4RLsfYdtvtGl7z%2F8G&RelayState=http%3A%2F%2Fprojeqtor.terensys.fr%2Fview%2Fmain.php 

No PHP error, no exception, no useful logs just this in projeqtor log.

2025-07-17 12:31:41.024 ..... SCRIPT .... 127.0.0.1 =====/sso/projeqtor/index.phpAnyone knows what could cause this?Thanks.