Need Answer to a small problem.

I host a group and lately I have been taping short update sessions on the real estate market locally and sending to the cloud for the purpose of forwarding the link to my prospective clients. One of my clients says that when he opens the video link the screen is in micro mode? When he sends me back his message with the text and link I sent him and I open it it's in regular size. I also asked another client I know well and he said he sees it in regular size... no problem. It seems to me that the problem is with the client's settings but I'm not sure.