Chrome "access-Control-Allow-Origin" header for origin error (CORS) - google-chrome

Question

I have the following setup:
Webserver 1 https://localhost:8888
Webserver 2 https://localhost:9005
Webserver 3 https://localhost:9006
I open https://localhost:8888 from a Web browser and enter the following JS code.
(async () => {
const endpointId = '1d60eb5195725648';
const continueUrl = 'https://localhost:9006/'
const signinUrl = new URL('https://localhost:9005/_login');
signinUrl.searchParams.set('continue', continueUrl);
signinUrl.searchParams.set('endpoint', endpointId);
const response = await fetch(signinUrl.toString(), {
credentials: 'include',
headers: {
'Authorization': `Bearer ${gapi.auth.getToken().access_token}`,
},
});
})();
I'm getting this error in my Chrome Browser Version 102.0.5005.115
Access to fetch at 'https://localhost:9006/?TOKEN=0<Truncated>c&endpoint=1d60eb5195725648' (redirected from 'https://localhost:9005/_login?continue=https%3A%2F%2Flocalhost%3A9006%2F&endpoint=1d60eb5195725648') from origin 'https://localhost:8888' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: The 'Access-Control-Allow-Origin' header has a value 'https://localhost:8888' that is not equal to the supplied origin. Have the server send the header with a valid value, or, if an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
Looks like Origin field is correct according to the info in Headers. What am I missing?
(I truncated Token to improve readability)
Requests:
Request URL: https://localhost:9005/_login?continue=https%3A%2F%2Flocalhost%3A9006%2F&endpoint=1d60eb5195725648
Request Method: OPTIONS
Status Code: 200 OK
Remote Address: [::1]:9005
Referrer Policy: origin
Access-Control-Allow-Credentials: true
Access-Control-Allow-Headers: Authorization
Access-Control-Allow-Headers: Proxy-Authorization
Access-Control-Allow-Methods: GET
Access-Control-Allow-Origin: https://localhost:8888
Content-Length: 0
Date: Sun, 12 Jun 2022 02:47:09 GMT
--
Accept: */*
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9,es;q=0.8
Access-Control-Request-Headers: authorization
Access-Control-Request-Method: GET
Cache-Control: no-cache
Connection: keep-alive
Host: localhost:9005
Origin: https://localhost:8888
Pragma: no-cache
Referer: https://localhost:8888/
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-site
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36
Request URL: https://localhost:9005/_login?continue=https%3A%2F%2Flocalhost%3A9006%2F&endpoint=1d60eb5195725648
Request Method: GET
Status Code: 302 Found
Remote Address: [::1]:9005
Referrer Policy: origin
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: https://localhost:8888
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Content-Length: 360
Content-Type: text/html; charset=utf-8
Date: Sun, 12 Jun 2022 02:47:09 GMT
Expires: Mon, 01 Jan 1990 00:00:00 GMT
Location: https://localhost:9006/?TOKEN=00cfdab4e480656ed7d71b3e58df42fe5422d85d33118a5af5fb7cc66f2d81330b46740ccbca4927ecfe841e751f0de72fdf53c4eb7d66b7c5ab857e33c6beaa270950fe0c49047fd5260db3120731d0abbfe3be1a0d316db4b0754610c81e2b070cea24e46e0e5ef76937c65832ef7c315b452b846e87f59be3124478cee49045162c&endpoint=1d60eb5195725648
Pragma: no-cache
Accept: */*
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9,es;q=0.8
Authorization: Bearer ya29.a0ARrdaM8mfOksOCl6l4O13z5PQv1cUVgKDKWgbo_rNXDL_Fw_-aedVVJdAFOSYByUjEy1WYrAKoik0KHx_c69aCXZcuAXbYedYkZRtDb5Y3Bz98eqjrOBjT0XrWspWdGNqRvsq_L_rDERdnsUFDFKCNiFCHV4sg
Cache-Control: no-cache
Connection: keep-alive
Cookie: _ga=GA1.1.1057744305.1654277711; _gid=GA1.1.1514740287.1654641546; _gat=1
Host: localhost:9005
Origin: https://localhost:8888
Pragma: no-cache
Referer: https://localhost:8888/
sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="102", "Google Chrome";v="102"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "macOS"
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-site
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36
Request URL: https://localhost:9006/?TOKEN=00cfdab4e480656ed7d71b3e58df42fe5422d85d33118a5af5fb7cc66f2d81330b46740ccbca4927ecfe841e751f0de72fdf53c4eb7d66b7c5ab857e33c6beaa270950fe0c49047fd5260db3120731d0abbfe3be1a0d316db4b0754610c81e2b070cea24e46e0e5ef76937c65832ef7c315b452b846e87f59be3124478cee49045162c&endpoint=1d60eb5195725648
Referrer Policy: origin
Provisional headers are shown
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Referer: https://localhost:8888/
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36