Unable to sucessfully upload a composition to the Workshop

[Retch 15]

Hello hello, today I come to you wise council with my problem: Unable to sucessfully upload a composition to the Workshop Now, I tried all of this already:
Different compositions, restarting ArmA, Steam, PC , disabling and reenabling Steam Cloud-Sync(req. for Workshop uploads), different ArmA 3 Profiles, with and without mods, I still get this error:
 

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Which translates to: Process failed. Action completed sucessfully.
If I check my Steam Workshop Content page, an empty item is found:
 

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.rpt content:
 

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18:28:55 Request failed: result: 2, req: class Steam::Query::CallbackQuery<class Steam::Query::QueryArgs,class Steam::Query::QueryArgs,struct SubmitItemUpdateResult_t,class Steam::Query::SubmitUpdate,struct Steam::Utils::DefaultResultChecker> * __ptr64, id: 8383377619438022582
18:28:55 class Steam::Query::SubmitUpdate query failed
18:28:55  query failed
18:28:55  12.3: SteamQuery:          class SteamFolderPublisher -       failed - Code: 1 - Aktion erfolgreich abgeschlossen.
18:28:55 Error during mission upload to steam. Error code: 1 - Aktion erfolgreich abgeschlossen.

Thank you in advance

[Retch 15]

Different location, same setup, different network, issue resolved! Possibly a routing or port issue. To anyone encountering this issue, I suggest to start your troubleshooting on that level.