Bitcoin Testnet Sync.API(): Kit Error Message: FileNotFoundException: https://btc-testnet.horizontalsystems.xyz/api

[TBCode523]

Hi all,
The Bitcoin testnet api is not working and gives the error: Kit Error Message: FileNotFoundException: https://btc-testnet.horizontalsystems.xyz/api. The easy workaround is to use the Sync.Full() option, however that's not really feasible for mobile users.
I've noticed that your api is powered by nginx, so I was wondering if there's been some kind of misconfiguration for the testnet.
Note: This is only effecting the Bitcoin Testnet. To my knowledge all other kits & Bitcoins Mainnet can still use the API.

[TBCode523]

Update: Dashcoins testnet API is not working. I get the following error: UnknownHostException: https://testnet-insight.dash.org/insight-api, Unable to resolve host "testnet-insight.dash.org": No address associated with hostname
The link leads to a deadpage. Was the original platform used https://testnet-insight.dashevo.org/insight/?

The only Kit that can successfully use the SyncMode.API() for the testnet is the LitecoinKit.
Let me know if there's anything you want me to try to solve this.
Thank you for your time!