If you are using Cloudflare, then follow the below steps to create DNS record for configuring subdomains for your subpages.
1 Log in to the Cloudflare dashboard. And, select an account and domain.
2 Go to DNS > Records
3 Click Add Record
4 Choose record type as CNAME record
5 Enter the required fields. Ensure the Proxy Status is set to DNS Only.
Example: (Replace host and value in the below screen with your values)
Record Type | Host | Value | Proxy Status |
CNAME | helpcenter | m4892848.subpage.app | DNS only |
Ensure that Proxy Status is set to DNS only.