ok, then let’s go one step back. I advise to always check the result of each step before you proceed.
Was the coregistration successful? You can check with an RGB image as described in this post: Fault marking by InSAR Data and difference between SLC_1SSV and SLC_1SDV?
If both images are aligned well, the RGB should be predominantly yellow. If not, the coregistration failed and therefore, no interferogram could be computed.
From your screenshots I see that you applied Orbit files and then performed coregistration.
If you selec the S1 TOPS Coregistration module, all required steps are computed in one go. Use the parameters I showed in the screenshots above.