Web Service Access key (WSAK) deprecation was announced over 2 years ago now. This has been postponed twice and will begin to get disabled in all tenants after Oct 1st, 2022.
Deprecated features in client, server, database - Business Central | Microsoft Learn
Users may start to see notifications in Business Central if they have a WSAK enabled on their user card. This can happen whether the user is actually utilizing the WSAK or not. The notification will allow them to click into a Wizard walk-through that will remove the WSAK from their user card.
Partners can use telemetry to determine if WSAK calls are being made into the environments. Find example KQL here: BCTech/AuthenticationWithWebServiceKey.kql at master · microsoft/BCTech · GitHub
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