fix(auth): Allow PKCE for legacy AccessCode OAuth2 Grant Type (#6011)

fixes #6010

Co-authored-by: Andrew Korshunov <andrew.korshunov@vizsc.com>

src/core/oauth2-authorize.js

@@ -74,7 +74,7 @@ export default function authorize ( { auth, authActions, errActions, configs, au
     query.push("realm=" + encodeURIComponent(authConfigs.realm))
   }
 
-  if (flow === "authorizationCode" && authConfigs.usePkceWithAuthorizationCodeGrant) {
+  if ((flow === "authorizationCode" || flow === "accessCode") && authConfigs.usePkceWithAuthorizationCodeGrant) {
       const codeVerifier = generateCodeVerifier()
       const codeChallenge = createCodeChallenge(codeVerifier)