35125: Maximum limit reached in the account for scheduling messages

There is a soft limit of 500,000 scheduled messages at any given time, per account_sid, that can be guaranteed. As each scheduled message is sent, more messages can be scheduled up to that limit.

The account_sid already has at least 500,000 messages scheduled.

Wait for the scheduled messages to be sent. At the send_at time, as the messages are sent (or canceled) the limit will free up. If this limitation is a blocker, kindly contact Twilio Support through the Console or Help Center.