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I have the WM Discover also. They usually report up to a week after the statement cuts. Sit tight, it will get there.
Also , as of yesterday, they are not GE Retail Bank anymore. They are now Synchrony Bank.
Mine cuts cuts on the 19th every month, and in July did not hit my report until 26th. Hope that helps.
I just saw what the new Walmart Mastercard looks like, and it looks good. Has the Emv chip also. An added bonus