Can no longer swap staging and production with unexpected error

Question

Hi: I have been running a particular web app forever. I made a few css changes, published to staging and now I get the error below when I try to swap. I find it impossible to actually create a support incident with Microsoft. I am supposed to view some analysis and click next. There is no next button. I am the owner, admin, etc. of my Subscription. So can anyone suggest a next step given this error? I would be eternally grateful!

Failed to complete swap between slot 'Staging' and slot 'production'. Error: {"_body":"{"Code":"InternalServerError","Message":"There was an unexpected error swapping slots 'Staging' and 'production' for site 'WTAB(Staging)'. Please try to cancel your swap operation.","Target":null,"Details":[{"Message":"There was an unexpected error swapping slots 'Staging' and 'production' for site 'WTAB(Staging)'. Please try to cancel your swap operation."},{"Code":"InternalServerError"},{"ErrorEntity":{"ExtendedCode":"04093","MessageTemplate":"There was an unexpected error swapping slots '{0}' and '{1}' for site '{2}'. Please try to cancel your swap operation.","Parameters":["Staging","production","WTAB(Staging)"],"Code":"InternalServerError","Message":"There was an unexpected error swapping slots 'Staging' and 'production' for site 'WTAB(Staging)'. Please try to cancel your swap operation."}}],"Innererror":null}","status":500,"ok":false,"statusText":"OK","headers":{"cache-control":["no-cache"],"content-length":["826"],"content-type":["application/json; charset=utf-8"],"date":["Fri"," 31 Mar 2023 00:07:18 GMT"],"etag":[""1D963620E7DA380""],"expires":["-1"],"pragma":["no-cache"],"server":["Microsoft-IIS/10.0"],"strict-transport-security":["max-age=31536000; includeSubDomains"],"x-aspnet-version":["4.0.30319"],"x-ms-correlation-request-id":["823cbf7a-2845-4573-b259-af7bd9704b09"],"x-ms-failure-cause":["service"],"x-ms-ratelimit-remaining-subscription-writes":["1198"],"x-ms-request-id":["823cbf7a-2845-4573-b259-af7bd9704b09"],"x-ms-routing-request-id":["WESTUS2:20230331T000718Z:823cbf7a-2845-4573-b259-af7bd9704b09"],"x-powered-by":["ASP.NET"]},"type":2,"url":"https://management.azure.com/subscriptions/21d2adce-0039-4a2d-8a8c-10f17d7fe139/resourceGroups/wtab/providers/Microsoft.Web/sites/WTAB/slots/Staging/slotsswap?api-version=2018-11-01"}