Yes. Android <5.1 or s.th. like that failed due to not having chrome available I think. 6.0 and 7.0 seem to have a different issue with the one of the letsencry

Yes. Android <5.1 or s.th. like that failed due to not having chrome available I think. 6.0 and 7.0 seem to have a different issue with the one of the letsencrypt certificate chains. OIDC for us seems to work on iOS 15, or not, depending on iPadOS 15 , iOS (Simulator), or iOS-out-in-the-wild .