I just discovered, that mastodon.social has a new way of subscribing. It now shows a popup where you need to copy the account link and then you have to go to your instance and paste the link to the search bar. It seems to me as a step back in a comfort.
#mastodon
:mastodon: 🔗👤😟
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glitchsoc - Link to source

Štěpán Škorpil

@Monzz And did you like it more before? The way it works on other servers for now? The old way is that it openes new window, where it asks to enter your account address. It then redirects you to user's profile view on your instance, where you can finish the subscription by clicking the follow buttton. There must always be a step that gets you to the user's profile on your instance. It's due to the federated nature of the network.