Failed to send message due to rate limiting

[smarthome-ha]

Hello all,

first of all, thanks for the good tutorials for the Signal Messenger AddOn.
I executed all steps from the Homeassiant.md an registered a new number successfully.

Unfortunetly I couldn't send a test message with this command:
curl -X POST -H "Content-Type: application/json" -d '{"message": "Test", "number": "+49151XXXXXX", "recipients": ["+49170XXXXXX"]}' 'http://192.168.0.XX:8080/v2/send'
The returned error message looks like that:
{"error":"Failed to send message due to rate limiting. Use the attached challenge tokens to lift the rate limit restrictions via the '/v1/accounts/{number}/rate-limit-challenge' endpoint.","challenge_tokens":["XXX-XXX-..."]}

Based on the command info of:
https://bbernhard.github.io/signal-cli-rest-api/#/Accounts/post_v1_accounts__number__rate_limit_challenge
I tried this command to level up the rate limit:
curl -X POST -H "Content-Type: application/json" -d '{"captcha": ["signal-hcaptcha.XXXX"], "challenge_tokes": ["XXXX..."]}' 'http://192.168.0.XX:8080/v1/accounts/+49151XXXXXX/rate-limit-challenge'
But with this answer:
"error":"Couldn't process request - invalid request"}

In general I surprised about the rate limiting, the log of the Signal Messenger AddOn shows now high number of send requests:
[GIN] 2024/04/24 - 20:00:21 | 201 | 1.630852284s | 192.168.0.XX | POST "/v1/register/+49151XXXXXX"
[GIN] 2024/04/24 - 20:02:42 | 201 | 9.216935186s | 192.168.0.XX | POST "/v1/register/+49151XXXXXX/verify/XXXXXX"
[GIN] 2024/04/24 - 20:05:41 | 201 | 6.223695112s | 192.168.0.XX | POST "/v1/groups/+49151XXXXXX"
[GIN] 2024/04/24 - 20:30:25 | 200 | 79.441µs | 192.168.0.XX | GET "/v1/about"
[GIN] 2024/04/24 - 20:30:25 | 429 | 581.942461ms | 192.168.0.XX | POST "/v2/send"
[GIN] 2024/04/24 - 20:45:59 | 429 | 523.564851ms | 192.168.0.XX | POST "/v2/send"
[GIN] 2024/04/25 - 18:17:47 | 429 | 855.536024ms | 192.168.0.XX | POST "/v2/send"
[GIN] 2024/04/25 - 18:30:50 | 400 | 371.959978ms | 192.168.0.XX | POST "/v1/accounts/+49151XXXXXX/rate-limit-challenge"
[GIN] 2024/04/25 - 18:33:54 | 400 | 79µs | 192.168.0.XX | POST "/v1/accounts/+49151XXXXXX/rate-limit-challenge"
[GIN] 2024/04/25 - 18:34:21 | 400 | 67.578µs | 192.168.0.XX | POST "/v1/accounts/+49151XXXXXX/rate-limit-challenge"
[GIN] 2024/04/25 - 18:36:14 | 400 | 75.806µs | 192.168.0.XX | POST "/v1/accounts/+49151XXXXXX/rate-limit-challenge"

Do you have an idea in general, why I have this rate limit issue and how the command should look like, to extend this limit?
Thank you very much for your help in advance.

Used Version:
Signal Messenger AddOn 0.83.0
Home Assistant Core 2024.4.3