@silverpill @nomad Iceshrimp.NET still didn't work, but this time I got the logs.
iceshrimp.net_web | dbug: [0HNDENVJ039HJ:00000006] Iceshrimp.Backend.Core.Federation.ActivityPub.ActivityFetcherService > Fetching activity https://mitra.social/@nomad as user a2vcb3w1qecg4t9t iceshrimp.net_web | dbug: [0HNDENVJ039HJ:00000006] Iceshrimp.Backend.Core.Services.NoteService: iceshrimp.net_web | Failed to fetch note, skipping: System.Exception: Redirection requested but no location header found iceshrimp.net_web | at Iceshrimp.Backend.Core.Federation.ActivityPub.ActivityFetcherService.FetchActivityInternalAsync(String url, User actor, UserKeypair keypair, Int32 recurse) in /_/Iceshrimp.Backend/Core/Federation/ActivityPub/ActivityFetcherService.cs:line 116 iceshrimp.net_web | at Iceshrimp.Backend.Core.Federation.ActivityPub.ActivityFetcherService.FetchActivityInternalWrapperAsync(String url, User actor, UserKeypair keypair, Int32 recurse) in /_/Iceshrimp.Backend/Core/Federation/ActivityPub/ActivityFetcherService.cs:line 88 iceshrimp.net_web | at Iceshrimp.Backend.Core.Federation.ActivityPub.ActivityFetcherService.FetchActivityAsync(String url, User actor, UserKeypair keypair) in /_/Iceshrimp.Backend/Core/Federation/ActivityPub/ActivityFetcherService.cs:line 52 iceshrimp.net_web | at Iceshrimp.Backend.Core.Federation.ActivityPub.ActivityFetcherService.FetchNoteAsync(String uri, User actor, UserKeypair keypair) in /_/Iceshrimp.Backend/Core/Federation/ActivityPub/ActivityFetcherService.cs:line 224 iceshrimp.net_web | at Iceshrimp.Backend.Core.Federation.ActivityPub.ActivityFetcherService.FetchNoteAsync(String uri, User actor) in /_/Iceshrimp.Backend/Core/Federation/ActivityPub/ActivityFetcherService.cs:line 235 iceshrimp.net_web | at Iceshrimp.Backend.Core.Services.NoteService.ResolveNoteAsync(String uri, ASNote fetchedNote, User user, Boolean clearHistory, Boolean forceRefresh) in /_/Iceshrimp.Backend/Core/Services/NoteService.cs:line 1360 iceshrimp.net_web | dbug: [0HNDENVJ039HJ:00000006] Iceshrimp.Backend.Core.Federation.ActivityPub.UserResolver > Running WebFinger for query 'https://mitra.social/@nomad' iceshrimp.net_web | dbug: [0HNDENVJ039HJ:00000006] Iceshrimp.Backend.Core.Federation.ActivityPub.UserResolver > WebFinger returned null, fetching actor as fallback iceshrimp.net_web | dbug: [0HNDENVJ039HJ:00000006] Iceshrimp.Backend.Core.Federation.ActivityPub.ActivityFetcherService > Fetching activity https://mitra.social/@nomad as user a2vdxx0wqe127186 iceshrimp.net_web | dbug: [0HNDENVJ039HJ:00000006] Iceshrimp.Backend.Core.Federation.ActivityPub.UserResolver > Failed to fetch actor https://mitra.social/@nomad: Redirection requested but no location header found iceshrimp.net_web | dbug: [0HNDENVJ039HJ:00000006] Iceshrimp.Backend.Core.Federation.ActivityPub.UserResolver > Failed to resolve user: Failed to WebFinger 'https://mitra.social/@nomad' iceshrimp.net_web | dbug: [0HNDENVJ039HJ:00000006] Iceshrimp.Backend.Controllers.Web.SearchController+<Lookup> > Request was rejected by Iceshrimp.Backend.Controllers.Web.SearchController+<Lookup> with 404 NotFound: No result found