dynamic return

[inland ravine]

import { Strategy } from 'passport-steam';
import { PassportStrategy } from '@nestjs/passport';
import { Injectable } from '@nestjs/common';
import { Request, Response } from 'express';

@Injectable()
export class SteamStrategy extends PassportStrategy(Strategy) {
    constructor() {
        super({
            returnURL: 'http://localhost:3000/api/auth/return',
            apiKey: '',
            passReqToCallback: true
        });
    }
    authenticate(req: Request, res: Response, options?: any): void {
        if (req.headers.referer) {
            const subdomain = req.headers.referer.replace(/(^\w+:|^)\/\//, '').split(".")
            if (subdomain && subdomain[0] != "www" && subdomain[0] != "localhost:3000") {
                console.log(subdomain[0]);
                // ideally set return url here
            }
            console.log(options);
        }
        super.authenticate(req, options);
    }
    validate(request, identifier, profile, done) {
        //console.log(request.headers.subdomain);
        const data = profile._json;
        
        let steamProfile = {}
        steamProfile["steamid"] = data.steamid;
        steamProfile["avatarfull"] = data.avatarfull;
        steamProfile["username"] = data.personaname;

        request.session.steamprofile = steamProfile;
        //console.log(request.query);
        return "Success"
    }
}```

How can I achieve  a different return url based on if the subdomain variable is present? I tried setting it through headers but they don't seem to persist between authentication and validate, and if I set a session variable there it also doesn't seem to get saved

[inland ravine]

Session variable doesn't even want to save in a pre-login route

Unsure why this is happening

console.log(request.session.subdomainn) is undefined in the return route

[inland ravine]

Been trying different things for hours and still can't persist data