IME does not work in the app version of "M365 Copilot Chat" (only hiragana can be entered)

Hi,Everyone.

Please help me with my problem.

Environment

• Windows Ver : Windows 11 Pro 24H2
• M365 Copilot Chat Ver : bizchat.20260210.47.1

Situation

• For the past few days, IME conversion has not worked and I can only input hiragana.

• The IME works properly on the web version, so you can input kanji characters as well.

Question

• Is this a known bug?

• How can I solve this?

Thank you,

best regards.