Thank you for you query Allene, we're sorry to hear that you are experiencing difficulties using Sinch. The issue could be with your TPS. TPS stands for Transactions Per Second and measures the amount of messages that can be sent through your account in a given time frame. A low TPS could make it difficult to send a high volume of messages quickly.
As a next step, we would recommend you raise a ticket with the support team to confirm that low TPS is causing the issue.
Thanks and kind regards,
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