Proxy number pools can include a maximum of 5000 Reserved numbers and 500 un-reserved numbers. We have detected that are getting close to one of those limits. Once you reach the limit, you will not be able to add more numbers to your pool.
You are nearing one of the limits in your Proxy number pool.
We strongly suggest that you shard numbers across multiple Proxy services. If you need more numbers than are specified by these limits, consider creating another Proxy Service for the additional numbers.