Accessing Microsoft Teams Free using personal or organizational credentials
Hello
Was the meeting hosted by an organization user?
If so, it is not asking you to create a personal account here. Rather, it is asking to check your email address to see if you have permission/access to that organization tenant.
Think of it like this - you were invited to an organization building to attend a meeting. The host registers you with your personal ID. When you get to the building, they check your ID and let you into the building to have the meeting. Later, you realize you forget something in the building and want to go back to get it. They want to check your ID again, but your permission is likely denied now since your permission has expired, and it was only given for that meeting.
You need to contact the meeting host. Have them share /send it to you instead in this case. When they share, have them use the "copy link" method and then send you the link.