@Matias Kiviniemi Thanks for posting your question in Microsoft Q&A, apologize for any inconvenience caused on this.
Are you still facing the issue? As error message says it looks like you don't have enough quota or number of cores in that region to create the app service.
I will recommend you consider deploying to a different region or using a different SKU if an immediate quota increase is not possible.
Only workaround to go with trial & error method or suggested in error message try creating the support case to increase the quota in that region by referring to this doc.
Hope this helps, let me know if you have any further questions on this.