Everyone else has great info in their replies. I'll add what I can.
As
@MS.Ragavendar has suggested make sure you have Permission on the List.
Are you able to see other lists just not the one you are looking for?
If you are able to see other Lists from the site, then it could be a Permission thing or the List may actually be a Library which will not show up.
Is your List a Library?
If you have Permission but you still can't access it, the go to your List in SharePoint. Go to List Settings. Copy the URL. It would look like this:
/_layouts/15/listedit.aspx?List=%7B12345678-1234-1234-1234-123456789012%7D
The value between %7B and %7D is the List GUID. If you copy and paste that into the Action, you may be able to Access the List. This worked for me one time when the source list was an old SP Tasks list.
What Action are you using in Power Automate? That would also help to trouble shoot what you are seeing or dealing with.
Let us know what you find.
This community is supported by individuals freely devoting their time to answer questions and provide support. They do it to let you know you are not alone. This is a community.
If someone has been able to answer your questions or solve your problem, please click Does this answer your question. This will help others who have the same question find a solution quickly via the forum search.
If someone was able to provide you with more information that moved you closer to a solution, throw them a Like. It might make their day. 😊
Thanks
-Mark
