Could not upvote on another instance [please explain for noob]

Copy paste the feddit.nl link into the Lemmy.ml search bar and search for it, it will fetch the post on Lemmy.ml

Ooooooooh I see! right.... yes that works.

I wasn't familiar with the idea of the instance 'fetching' a post. Thank you!

you can log in to your 'home' instance and should be able to view/upvote the local version of the feddit.nl article.

im not sure about lemmy, but I can just enter the full url into the home instance search box to locate that local version you want to upvote

While your particular issues is solved, you should be aware that lemmy.ml is one instance of the Tankie Triad, which many other instances have blocked. Unless you like living in tankieland, I would suggest you make an account somewhere else.

Thank you all for explaining.

The behaviour I was expecting was to click 'login' on the feddit.nl page, and that login page to recognise that I was logging in with the credentials used by lemmy.ml, and to log me into lemmy.ml instead, and then to be redirected to the 'local' version of the link on the lemmy.ml instance.

Rather than it just be a feddit.nl login page only, and be told 'log in not recognised'. That's where my confusion came from. I'm like "wait, I can't log into Lemmy here? why?!"

related feature request: https://github.com/LemmyNet/lemmy-ui/issues/2318

more technical discussion here: https://socialhub.activitypub.rocks/t/fep-3b86-activity-intents/4120/12

If you see yourself facing this often, you can also use a browser extension to make it easier to see the post you are at in your instance.

For Firefox and derivatives, the simplest one is Lemmy Link, which places a Lemmy icon next to links such as the sibebar's !community link in the instructions for logged out users to find the community in their own instance. It has not been updated in two years, but still works.

Another option is Kbin Link, which does the same thing and has seen recent updates but tends to trigger "this extension is slowing down..." notifications.

A third one I found is Instance Assistant, which instead adds a "Find in my home instance" button to the sidebar. It does have some additional features, but I couldn't get them to work. This one is also available for Chromium-based browsers.

You need to view the post from .ml I think you add the .nl link after lemmy.ml/ do not remember the exact syntax. You could also go to the community from .ml and look for the post.

Same reason you can't use your Gmail credentials to log into Outlook.

Instances don't have to be federated and instances federate and defederate from each other often enough. The goals of instances may not align, and to keep conflict low(er) it's better if some instances cut ties.

TBH, this sounds like a technical issue between ml and nl or just a typo in the way you are posting.

While I thought it was basically an on/off switch for defederation, I suppose there could be a way to block updates from instances without fully defederating.

I am not going to get into the drama, but ml is defederated at a little higher frequency, but it's not as high as some others. It's because reasons, and is not relevant to this particular thread.

The whole linking to other instances and services like lemsha.re or lemmyverse.link within Lemmy should become obsolete in the next release of Lemmy. It will include rewriting remote instance URLs to the local instance equivalent.

Copy the post link into the search on lemmy.ml and you should find it.

You may wish to use a script to change all Lemmy links to point to your home instance https://greasyfork.org/en/scripts/469273-lemmy-universal-link-switcher