Cross domain auth

I have a scenario where a single hono api serves different frontends
the api is at domain a.com
frontends are at domain b.com, c.com, etc

I set config like this

defaultCookieAttributes: {
  httpOnly: true,
  path: '/',
  sameSite: process.env.NODE_ENV === 'production' ? 'none' : 'lax',
  secure: process.env.NODE_ENV === 'production',
 },


but no luck.

Is there anything I'm missing or is this case not possible?

Client has this enabled:
fetchOptions: {
 credentials: 'include',
},


Allowed origins all set
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