Receiving a 414 Request-URI Too Long calling signOut in the okta-auth-js code

I’ve setup OIDC SSO for a SPA application using the okta-auth-js and okta-vue npm libraries and I’m having some issues. Everything works great except for the logout. The okta-auth-js signOut() function builds the logout url which includes the id-token-hint and post_logout_redirect_uri. Everything looks correct according to the logout spec on the Okta website. The length of the URL is about 18K due to the large idToken value.

The logout GET returns with a 414 Request-URI Too Long. Any ideas how to resolve this? We are currently using the Okta Classic Engine.