Links sent by email will be invalid

[Diana81]

Hello,

I often have the problem, that links I sent days before the meeting are invalid, when my students click on them (it appears Error 403 on the screen).

I checked the link. It is exactly the same as in my meeting planner.

And if I copy the link again and send it shortly before the meeting starts it works.

Maybe I am a bit dumb, but does anyone here as a solution? 

And sorry for my bad English, I am German, so if there would be a German zoom-Pro it would be great.

Kindest regards

Diana