Our Marketplace team is still working on enabling custom URL schemes for all apps. Until this is complete, only server-to-server OAuth will be possible.
But will the deprecated way work with the old Zoom SDK version? While we can’t use all abilities of PKCE? - (ZoomSDKError)login:(NSString*)userName Password:(NSString*)password
The login method in the SDK will still work for now, but eventually any version of the SDK which still contains this method will no longer be capable of joining meetings. If server-to-server is not feasible for your implementation, I would definitely recommend migrating over to PKCE as soon as it is available.