By default, the Bold Reports Azure App Service will have an expired license key. You need to replace your Bold Reports license key in the Bold Reports Azure App Service by following these steps:
App Service editor
under the Development tool in the options as follows.
/site/wwwroot/app_data/reporting/configuration/boldlicense.txt
and replace your license key.Create Bold Reports Azure App Service using ARM template
Upgrade Bold Reports Azure App Service from v1.x to latest
Upgrade Syncfusion Report Server Azure App Service from v4.x to latest