AMD FirePro DP to Dell S2719DM HDMI 2.1 only works at HD 1080i 25Hz, How can I connect at Quad HD?

Video Connector Adapters, Converters, and Cables DP-HDMI & MDP-HDMI
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I bought the Plugable Active DisplayPort to HDMI 2.0 Adapter (Supports displays up to 4K / UHD / 3840x2160@60Hz) and I am connecting a AMD FirePro V7900 (FireGL V) Graphics Adapter to a Dell S2719DM (HDMI2.) monitor. It doesn’t work,

What did I do wrong?

How can I fix it and how soon?

Thank you.

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