Microsoft Graph connectors API limits

This article describes implementation and operational limits for Microsoft Graph connectors. Keep these limits in mind when designing connectors.

Connection limits

Limit type	Limit
Connection resources per Microsoft 365 tenant	10 for search, 15 for compliance
Items per connection	5,000,000
Connection byte size	500 GB

Schema limits

Limit type	Limit
Properties that can be defined in a schema, characterizing the data ingested through a connection	128

Group limits

Limit type	Limit
External groups per Microsoft 365 tenant	100,000
Requests allowed per second (requests/sec) in the group administration throttling threshold	1,000

Item ingestion

Limit type	Limit
Throughput limit to ingest items through a connection	25 items/sec
Item size; this limit applies to the request body when ingesting and indexing an item	4 MB
Property size	N/A

Throttling

When a throttling threshold is exceeded, Microsoft Graph limits any further requests from that client for a period of time. When throttling occurs, Microsoft Graph returns HTTP status code 429 (Too many requests), and the requests fail. A suggested wait time is returned in the response header of the failed request.

Throttling behavior can depend on the type and number of requests. For example, if you have a high volume of requests, all request types are throttled. Threshold limits vary based on the request type. Therefore, you could encounter a scenario where writes are throttled but reads are still permitted.