Microsoft is removing Web Service Access Keys (Basic Auth) for SaaS with Business Central 2022 release wave 1 (https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/upgrade/deprecated-features-...). From April 2022 the Rest Connector doesn't work with Business Central SaaS API (https://docs.microsoft.com/en-us/dynamics-nav/api-reference/v2.0/). OAuth-Support for the Rest Web Service like with your "Microsoft Dynamics CRM V2 Connector" is necessary to access the Business Central API (https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-develop-con...).