Composing Email Button not Functioning

Trying to compose a group email using the my scouting unit roster. When selecting members to compose an email to the function opens my email software (Office 365) and tries to fill in the BCC fields except the tab is completely blank and only showing commas. I have tried this multiply times and cleared my browser history and cache. This has worked in the past for me as COR. Not sure what changed to break this function.

Browser is Chrome v130.0.6723.117
Windows 10 PC OS Build 19045.5073

@EdwardHapp I have never used that feature - probably a question for council so they can turn in a National Membercare ticket