Hi,
If you are talking about Grafana Cloud, indeed there is a limitation on the number of users :
What you get:
- 10,000 series for Prometheus or Graphite metrics
- 50 GB of logs
- 14-day retention for metrics and logs
- Access for up to 3 team members
Ref : Grafana Pricing | Free, Pro, Advanced, Enterprise
If you are talking about Grafana on your servers, there is no limit on users.
Please check the logs you might be getting other errors.
Good Luck