get_metadata endpoint cannot find valid namespace IDs

Are the namespace IDs for the team members' home folders?

By default, API calls operate using the member's home folder as the "root", but you can't retrieve the metadata for"root". So, while the folders have contents that can be listed, you can't retrieve the metadata for the folder itself.

For teams using the team space though, you can optionally set the "root" for an API call to be the team space's root, in which case you can retrieve the metadata for the user's folder under that team space root. You can find information on how to do so in the Namespace Guide here.

As a concrete example:

# given a user who is a member of a team with the "team space configuration", with these values:
#     "root_namespace_id": "1990815600",
#     "home_namespace_id": "1990696960",

curl -X POST https://api.dropboxapi.com/2/files/get_metadata \
    --header "Authorization: Bearer <ACCESS_TOKEN>" \
    --header "Dropbox-API-Select-User: <MEMBER_ID>" \
    --header "Content-Type: application/json" \
    --data "{\"path\": \"ns:1990696960\"}"

# ^ this one doesn't work, since you're trying to get the metadata for the current "root"

curl -X POST https://api.dropboxapi.com/2/files/get_metadata \
    --header "Authorization: Bearer <ACCESS_TOKEN>" \
    --header "Dropbox-API-Select-User: <MEMBER_ID>" \
    --header 'Dropbox-API-Path-Root: {".tag": "root", "root": "1990815600"}' \
    --header "Content-Type: application/json" \
    --data "{\"path\": \"ns:1990696960\"}"

# ^ this one does work and returns the metadata for the member's folder under the team space root