@Alan24
I'm just another Google Nest customer, and don't know why your subscription should have "vanished" other than for non-payment).
If you have NOT migrated your Nest Account to a Google Account and have had a 1st gen Nest Aware subscription, you should be able to check your subscription here:
http://store.nest.com/account/subscriptions
If you have already migrated your Nest Account to a Google Account, when you try to visit the above site, you will be automatically transferred to the Subscription Management page for 2nd gen Nest Aware subscriptions (available since 2019):
https://store.google.com/subscriptions
(We migrated our Nest Account to a Google Account in 2020, and switched to a 2nd gen Nest Aware subscription then because it was cheaper.
Note the following: "As of July 13, 2023, Google will no longer sell new subscriptions of 1st gen Nest Aware. Any 1st gen subscriptions that you currently have will continue to renew" (https://support.google.com/googlenest/answer/9233159).
This is Google Nest's Nest Aware price list:
https://store.google.com/us/product/nest_aware?hl=en-US&modal=upgrade-pricing
If you want to migrate your Nest Account to a Google Account, see this Help topic:
https://support.google.com/googlenest/answer/9297676
