Most likely causes
1) Environment prerequisites not fully met
No Dataverse database in the current environment, or wrong environment selected.
Region/tenant prerequisites not satisfied.
2) Permissions / policy blocks
Missing System Administrator/System Customizer rights, or Managed Environments/DLP policies blocking solution and table creation. (Permissions are a listed prerequisite for Plan Designer work.)
3) Browser/network layer
Extension/ad‑blocker, third‑party cookie block, corporate proxy/CSP causing a generic Network Error in the studio UI (seen in similar “Network error” save scenarios).
4) Service-side instability (preview/rollouts)
Plan Designer and Copilot features have had intermittent incidents per community threads; opening a support ticket was suggested/resolved in some cases.
Some troubleshoot ideas:
1) Open the right environment in Power Apps --> Settings --> Resources --> Dataverse to confirm a Dataverse database exists. If missing, provision it or switch to an environment that has one.
2) Check your role, ensure you have System Administrator (or System Customizer) before running “Create a plan.”
3) Try a clean browser profile, in Edge/Chrome InPrivate, disable extensions/ad‑blockers, allow third‑party cookies, and retry Save tables. Similar network errors in Power Apps have been caused by client-side issues.
4) Switch environments, try in a Developer environment (often auto-provisioned with Dataverse and maker perms).
5) Check admin policies, if your tenant uses Managed Environments or strict DLP, saving Dataverse artifacts from Plan Designer may be blocked, ask your admin to review. (Prereq docs flag tenant/environment settings.)
6) If it still fails, capture the time/correlation IDs from DevTools/Monitor and open a Microsoft support ticket.
Give it a try:
Manual tables --> “Create plan from solution”:
Create the Dataverse tables manually (the same schema Plan Designer proposed).
Put them in a solution.
Use Create a plan --> From this solution to continue with apps/flows generation.
Implement from the plan without saving tables:
If the plan shows the schema, use it as a spec and build the tables in Dataverse, then return to the plan to proceed.
Try another browser/PC or network (hotspot/VPN off) to rule out corporate network policies causing the generic “Network Error.”
References:
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