Guest names have double quotes and backslashes around their names, their initials are missing
It started this monday in Teams application on Windows, in Czech locale. Guest names ("Host" in the Czech language) are enclosed in double quotes and with backslashes. For that affected users (most of them, maybe all), there are also missing initial letters of their name (e.g. instead of "JB" for Joe Black, there is only an icon of the user).
It seems that double quotes are replaced with backslashes and next double quotes on next login and it is growing. After few days, the name may completely hide in double quotes and backslashes.
Please analyze and try fix: - why there are appearing this double quotes and backslashes, - why there are missing initial letters of names. Thanks.