Hi Maria,
Did you follow what Zhifang commented earlier in the post? Please also check the versions of the web app from Survey123 website>Settings>Versions>choose "Always use the latest version(3.8).
Here is the comments posted earlier in Feb:
Hi All,
This issue has been fixed in 3.8 hotfix1 which is available on the Survey123 website now.
For surveys published from now on in the web designer, the geopoint question can work in Survey123 field app as previously. For surveys published after 1/21 (3.8 release) and before today (2/11, 3.8 hotfix1), they need to be republished again in the web designer if you want to use the map of geopoint question in the field app.