If your app cannot launch or is stuck loading on the launch screen, one possible reason is that your server is blocking the V2 Authentication API. The API endpoint "https://www.[your_domain]/wp-json/wp/v2/users/[user_id]" can result in 400 bad requestcause errors. API restrictions set by the server usually causes such errors. I would recommend that you contact your hosting provider to address this issue. Please share the following information with them so that they can assist you further.

Getting 400 Bad Reuqest Error for https://www.bb.com/wp-json/wp/v2/users/[user_id] API endpoint.

Here is the curl:
curl -X GET -H "X-Forwarded-Url: https://www.bb.live/wp-json/wp/v2/users/159" -H "Accesstoken: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJodHRwczpcL1wvd3d3LmhhcHB5dGltZS5saXZlOnJlc3QtYXBpIiwiaWF0IjoxNjgyNTc4ODUxLCJuYmYiOjE2ODI1Nzg4NTEsImV4cCI6MTY4MjY2NTI1MSwianRpIjoibzFFdDVMI0VBdk5VcCkxWUw3RCZJVGgpd3FuUEoyOCN3MkBEKmNGSzdvWSIsImRhdGEiOnsidXNlciI6eyJpZCI6IjE1OSJ9fX0.vjJAGtF1wBX8FhM-R9gp0C-ROycXgy7zs1y8JjZhPSk" -H "Appcodeversion: 1.9.71" -H "Accept: application/json, text/plain, */*" -H "X-Forwarded-Host: www.bb.com" -H "Appversion: 0.1.2" -H "Host: www.bb.live" -H "Appid: e12660" -H "X-Forwarded-Proto: https" -H "Appplatform: ios" -H "Accept-Language: en-US,en;q=0.9" -H "User-Agent: bb/13 CFNetwork/1406.0.4 Darwin/22.4.0" -H "Via: 1.1 martian-28d64161c520817f3dc9" -H "X-Forwarded-For:" https://www.bb.live/wp-json/wp/v2/users/159 --compressed