Need help dealing with Client TLS handshake failed. The client does not trust the proxy's certificate

Hi. I'm new to mobile developping.
I'm trying mitmweb 12.2.1 to figure out an api request from a Android-App/iOS-App, which is called "doubao". Now I have error messages like this:

Client TLS handshake failed. The client does not trust the proxy's certificate for api5-normal-gl.doubao.com (OpenSSL Error([('SSL routines', '', 'ssl/tls alert certificate unknown')]))

Here is what I have tried

• Installed cert on Android Phone and iOS Phone. Installed Magisk modules MITMProxy cert on Android Phone. Now the cert can be seen on both SYSTEM and USER in Trusted credentials.
• Tried both Transparent Proxying Mode (with hotspot and iptables) and WireGuard Mode.
• Tried objection patchapk with the apk file, and tried android sslpinning disable
• Tried start mitmweb by ./mitmweb --mode wireguard --showhost --set dns_name_servers=192.168.1.1 --set request_client_cert=true, or without --set request_client_cert=true

I think I had the cert enabled system-wide and all the traffic were going through mitmproxy. I even disabled the Certificate Pinning.

Most traffic of apps on my phone can be seenin flow list. There were a lot of https request, but not that doubao-app .
When open the doubao-app, a lot error message pops up.

Did I miss something?
What should I do next?