use this, should work on browser and mobile. Only the video no browser around it:
<div style="max-width: 56vh;"><div style="left: 0; width: 100%; height: 0; position: relative; padding-bottom: 177.7778%; padding-top: 120px;"><iframe src="https://www.tiktok.com/embed/6992668750692584710" allow="fullscreen" style="position: absolute; top: 0px; left: 0px; height: 100%; width: 100%;"></iframe></div>
if you copy the link in the browser, the id past /video/<id> is after:
https://www.tiktok.com/@chxpel/video/6992668750692584710
https://www.tiktok.com/@chxpel/video/6992668750692584710?_d=secCgYIASAHKAESMgowqNapWkcwXXMUL8XirwKormCQYBK%2BSX94FpKmdd8b2scWQe6%2FHO8oZ8KP4kuUcXuuGgA%3D&checksum=f73b26369667cff1fb4c8cc490999ff372653c2ac7cbbf75c69d9b0d3219b9a8&language=en&preview_pb=0&sec_user_id=MS4wLjABAAAAODckTkRSfQcWlulXsfbY4CdFAU8RcrRMQ_3voWZ5YC5DQEedP_3dHTKhKc7QGcKu&share_app_id=1233&share_item_id=6992668750692584710&share_link_id=1E1EEEFF-C41C-4EFF-92D5-431665022972&source=h5_m×tamp=1628135386&tt_from=more&u_code=daf673i1ik72mf&user_id=6786172559488287749&utm_campaign=client_share&utm_medium=ios&utm_source=more&_r=1
you can also just parse it out of a curl as well
curl https://vm.tiktok.com/ZMdwUhfAk/ | cut -d "." -f3 | cut -d "/" -f3