on trying to implement implicit code grant getting below error #30

on the screen i'm getting
Oops, we have encountered a problem.

Message:

Dump:

Please check your account configuration. If you are unable to resolve the problem, open a new issue on GitHub.

and in network tab i'm getting :

Request URL:
http://localhost:8080/ds/authenticate
Request Method:
POST
Status Code:
403 Forbidden
Remote Address:
[::1]:8080
Referrer Policy:
strict-origin-when-cross-origin
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Encoding:
gzip, deflate, br
Accept-Language:
en-US,en;q=0.9,hi;q=0.8
Cache-Control:
max-age=0
Connection:
keep-alive
Content-Length:
18
Content-Type:
application/x-www-form-urlencoded
Cookie:
JSESSIONID=880D8105962D3FB072F831CEC790D8E6
Host:
localhost:8080
Origin:
http://localhost:8080
Referer:
http://localhost:8080/ds/mustAuthenticate
Sec-Ch-Ua:
"Not_A Brand";v="8", "Chromium";v="120", "Microsoft Edge";v="120"
Sec-Ch-Ua-Mobile:
?0
Sec-Ch-Ua-Platform:
"Windows"
Sec-Fetch-Dest:
document
Sec-Fetch-Mode:
navigate
Sec-Fetch-Site:
same-origin
Sec-Fetch-User:
?1
Upgrade-Insecure-Requests:
1
User-Agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0