Hi @Marina
According to your description, you may roll back your Microsoft 365 Apps to earlier version to have a check.
Press Win + R, close Run dialog, then enter the command below.
"C:\Program Files\Common Files\microsoft shared\ClickToRun\officec2rclient.exe" /update user updatetoversion=16.0.14326.20404
Besides, if there is any anti-virus software, you may quit or disable it temporarily.
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