How to configure Adguardhome-sync to connect to adguard instance on Flint2 router?

Technical Support for Routers
1

As by default to access webgui of AdGuardHome on gl-inet router I need first to login into router, is there any trick to do in adguardhome-sync to set-up acess correctly, in this section, or on router?

adguardhome-sync config on external machine:

origin:
  # url of the origin instance
  url: http://192.168.1.1:3000
  # apiPath: define an api path if other than "/control"
  # insecureSkipVerify: true # disable tls check
  username: username #which? no username in adguardhome config.yaml in router
  password: password #same q as username
  # cookie: Origin-Cookie-Name=CCCOOOKKKIIIEEE

as by default i get error:

adguard adguardhome-sync[921]: 2025-01-16T11:24:34.265+0100        ERROR        sync        sync/sync.go:170        Error getting origin status        {"from": "192.168.1.1:3000", "error": "403 Forbidden(Forbidden)"}
2

See