dopost publishes to Facebook Pages, not personal profiles. The Facebook user you authorize must have full control of the Page or permission to create Page content.
Connect a Facebook Page
Select Connections from the sidebar.
Select New Connection and choose Facebook.
Sign in to Facebook.
Select the Pages you want to use.
Grant all requested Page permissions.
Return to dopost and select the Pages to connect.
Platform Limits
Reconnect Facebook Pages
Reconnect a Page when dopost shows Expired, Reconnect required, or asks you to renew its permissions.
Select Connections from the sidebar.
Find one of the affected Facebook Pages and select Reconnect.
Sign in with the same Facebook profile you used to connect those Pages.
Select the Pages in Meta’s authorization screen and approve all requested permissions.
Return to dopost.
dopost refreshes every Facebook Page in the current workspace that is available to that Facebook profile. You do not need to reconnect each of those Pages separately.
Only Pages connected through the same Facebook login are refreshed together. Pages connected through another Facebook profile are unchanged and must be reconnected using that profile.