Report player doesn’t always work

Like the title say I have been having this issue for the last 2 day if I blacklist a player then click report there is a 50/50 chance that the report screen does not come up and when this happens no mater how many times I go back and click it nothing happens

You also can't report a player that doesn't have a Gamertag, last I checked. This means, that if someone, including a bot, is using the Steam version, you can't report them.