Auth fails in client due to empty oauth.state in redirectUri when using iframe

[Ray4R]

i'm using OAuth client with Nextclouds OAuth. Everything is working great.
But when starting OAuth out of an iFrame ( i embed my site as nextloud externel site) no state is giving after grant access to my site.
Authorization code is set but state is empty.

https://...myserver/nextcloudlogin?state=&code=6a8Vk6cSEIhVcXZEcKBjGLWj4sIbmMhn...

Any help would be appreciated

[edsonhoraciojunior]

Do your iframe load correctly? Some services will fail OAuth requests - when it was originated from within an iframe - for security reasons. The response headers/body should contain more info as to why they failed.
I faced this when trying to use Google OAuth inside an iframe.