I have talked about this situation with our engineering department. Up to now, there have been no changes for asynchttp_v1, so it should be working as usual.
Based on your description, the problem could be related with the rate limits in the third-party cloud (https://mysmartblinds.auth0.com).
This request originates in the Amazon EC2 instances where the SmartApp runs in, if there is a rate limit with the requests number from an IP address, it could cause the rejection.
If your SmartApp will only send commands from SmartThings to the third-party cloud, then, you could migrate your Groovy SmartApp using the SmartApp SDK. This tutorial is a good starting point, and I can help with this process if you share more details about it.
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