Could not create token: Using integers for registered date claims is deprecated, please use DateTimeImmutable objects instead.

具体原因：lcobucci/jwt版本3.4及更高版本，

• Release 3.4.0 · lcobucci/jwt
• https://github.com/lcobucci/jwt/issues/550#issuecomment-734509109

可能遇到的场景

tymon/jwt-auth版本小于1.0.2的会出现这个问题，因为依赖lcobucci/jwt，但却又不锁定版本，导致会自动升级到lcobucci/jwt3.4及以上版本，将tymon/jwt-auth升级到1.0.2即可，具体实现就是把lcobucci/jwt降级到3.4以下，看这里：Releases · tymondesigns/jwt-auth。

临时解决：https://learnku.com/laravel/t/51873