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I read my email on my phone. I rarely (read: never) use Cox's webmail as it's simply not a good format for mobile mail.
I use the Gmail app on my phone to read and send email, however, Cox doesn't send the Spam or Junk folders. I have several Cox email accounts and every one of them exhibits this behavior - no spam or junk folder.
This is on a clean and fresh installation of the Gmail app on a new Galaxy S21 Android phone.
I have gone to the webmail settings and made sure that Spam/Junk is marked as Subscribed in the IMAP settings.
This is only important because sometimes email is delivered to Spam/Junk by mistake and I have no way to check those folders.
How do we fix this?
Just curious, but if your using the Gmail app, why not just use Gmail?
Because I have several Cox email accounts that I've used for 25 years. Moving everything and everybody from one email address to another is not practical.
I should add... I have gmail accounts too (business and private accounts).