Can you check in the about page what version of Chrome you have? The 404 error there won't be causing the connection problem. The IDE searches by name, but also by the advertised services (UART), and those should be the ones the Ruuvitag is picked up by.
However, older versions of chrome did have a problem with that.
Also, what name does the Ruuvitag appear as in the nRF connect app?
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