Facing the error - Issued at time is more than 600 seconds before or after the current time

Describe the bug
When I try to authenticate against an authorization server, I am getting this error Error Domain=org.openid.appauth.general Code=-15 "Issued at time is more than 600 seconds before or after the current time" UserInfo={NSLocalizedDescription=Issued at time is more than 600 seconds before or after the current time}

The device's date and time are set properly.
It was working properly for some time and now all of a sudden this error occurs

To Reproduce
Steps to reproduce the behavior:

1. Download the example project
2. Provide your issuer, client ID, redirect URI, and client secret
3. Try to login
4. It logs in but in the call back, we get the error Error Domain=org.openid.appauth.general Code=-15 "Issued at time is more than 600 seconds before or after the current time" UserInfo={NSLocalizedDescription=Issued at time is more than 600 seconds before or after the current time}

Expected behavior
The accesstoken should be available.

Smartphone (please complete the following information):

• Device: iPhone 12 mini simulator
• OS: macOS BigSur, M1
• Xcode Version 12.5 beta

Start with the example project and reproduce the authentication flow on the reported iPhone simulator and macOS/Xcode setup. Inspect the callback handling around the issued-at validation and compare the token timing with the device clock; done means identifying a reproducible cause and confirming the access token becomes available without this error.