May I know your role in the team? If you're a guest user, it could be related with the meeting policy of the meeting organizer's Office 365 tenant. In Teams admin center, the Office 365 admins can set up the meeting policies to disallow Meet now in private
meetings for guests. In this scenario, the guests cannot join the "Meet now" meetings. And you need to contact the Office 365 admins of their tenant to change the meeting policy.
While if you role is team member, please use Chrome browser to sign in
Teams web client to check if you can join the meeting. Meanwhile, if you go to Calendar tab, does the meeting event appear in your calendar?
* Beware of scammers posting fake support numbers here.
* Kindly Mark and Vote this reply if it helps please, as it will be beneficial to more Community members reading here.
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