I found the problem and solved it. Usually I would update via Upgraade ABP Package in ABP Studio Menu. I just changed to another way: ABP CLI execute [abp update --version 9.1.0], and the project can run smoothly.
Thanks again for your help!
I have re-generated openiddict.pfx and made some adjustments according to the documentation, but the original problem still occurs. I would like to remind you that: a. It was able to run normally in v9.0.4; the problem occurred after upgrading to v9.1.0. b. The error event mentioned occurred during module Volo.Abp.OpenIddict.AbpOpenIddictDomainModule (Volo.Abp.OpenIddict.Domain, Version=9.0.4.0); but I searched the entire project code and could not find any content related to using Volo.Abp.OpenIddict.Domain !
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