Signing into gmail on safari gmail says cannot sign in because this website or app is not secure⁉️

Privately signing into my email @gmail.com on safari… after signing in… gmail’s message response: cannot sign in to gmail account because this website or app is not secure? Does anybody know what this could mean? Is my device secure? If not what should I do to fix this issue /or protect my device which is an iPad Pro, 2020? Thnx in advance!