Hope you are doing well.
I am sorry it took me a little longer than expected.
You are most probably having the issue on a multisite install.
The Capital Letters plugin is not compatible with multisite and gives the error with/ without the ajax registration.
Can you please let me know if it is a multisite install? Also, If you want, I can update the code of the Capital Letters plugin to make it multisite compatible.
If it is not multisite the plugin should have worked. is there any chance that you are using the User Name availability checker plugin too?
Sure, I will update the Allow Capital Letters plugin for multisite. Please allow me 2 days for that.
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