Misskey: Remote boost from Mastodon throws error "acct is not an user"

[chocological00]

💡 Summary

When trying to boost Mastodon's status from its original instance using misskey account, misskey throws "acct is not an user" error.
Following status has been used for testing:

The page below can be accessed via pressing the the boost button below the status:

🙂 Expected Behavior

When using other mastodon account (@[email protected] in this case) it works fine, resolving the toot user interacted in that instance (twingyeo.kr):

☹️ Actual Behavior

When using the misskey account (@[email protected]) it shows following error:

📌 Environment

Mastodon 3.0.1 -> Misskey 11.35.1

[mei23]

Probably 'Remote Boost' is not implemented yet

Mastodonの実装を見ると
webfingerの "rel":"http://ostatus.org/schema/1.0/subscribe" の href に
ユーザーじゃなくて投稿のURLを入れると取得して投稿を表示してブーストなど出来るみたい？だけど仕様が見つからないのでよくわからない

[acid-chicken]

Related to #3899

[tamaina]

Maybe related to #2217

[aphroditus]

This issue is not resolved. It still exists in 12.47.1

[mei23]

なおってないんじゃなくてv12で壊したかサポートされなくなった
Not a user と出る