Issue
A project expects extended service access to remove every DataStore limit, but writes still reject oversized or excessive data.
Cause
Extended capacity does not eliminate per-entry, request, or architecture constraints.
Fix
Identify the exact limit from the error and dashboard. Reduce entry size, request frequency, or total retained data as appropriate. Apply for or configure extended service only for a proven capacity need, not as a substitute for bounded save design.
Verify
Measure the largest record and peak request rate, then repeat the failing operation under the documented limit.
Official Roblox extended DataStore services announcement
#1
Original Heliotrope guidance with authoritative Roblox sources.