See screenshot of Data Source Manager of Delimited Text input. Sample data look fine.
When I press 'Add' no data shows. World Map layer is EPSG-3857-WGS 84 / Pseudo Mercator. Am I using the wrong CRS? Using MacOS 10.14.6 Mojave and QGIS 3.12.1.
The coordinates you are trying to add, are not EPSG:3857 coordinates. They seem to be EPSG:4326 coordinates. Maybe your data is added, but at the wrong place. Try zooming on lat/lon 0,0 (at the coast of Africa) to check it. If they are there, setting Geometry CRS to EPSG:4326 should solve the problem.
EDIT: Your coordinates are treated as text fields because of the ° characters. Delete them and it will work fine.