All three Nexus onion addresses with the check to run before signing in, why several exist and how to save them so you never have to go searching.
nexusb2l7fmqnefwphyy7m5zjhlkytlbo7qbb5lu5dlczr3azgii2gyd.onionnexusma2iqgauqqvjcgds4ckv5xbf272tkfagq4epojjhsgleqpwxiqd.onionnexusabcd6tyfhdwilyitaqiri6tisj2v2hueyjuj6qkvd6azvi5tuqd.onionEvery address on this site is published in the same place on every page, at the top, so you never have to hunt for one. This page explains what they are and how to keep them.
An onion service reachable at exactly one address stops being reachable the moment that address is flooded, and flooding one is cheap. Publishing several at once means an attacker has to hold all of them simultaneously. For you the benefit is smaller and more practical: when one is slow, another usually is not, and moving between them costs nothing.
There is no separate account per address and nothing to move across. If an order looks missing after switching, you are almost certainly signed out rather than looking at different data.
An onion address is fifty six characters derived from a key rather than chosen by anybody, so there is no pattern to help you and nothing to catch a slip. Two addresses differing by a single character are unrelated services with no connection at all. Use the copy control above.
When the login screen loads, compare the onion printed on the page against your address bar, reading from the end backwards. The last characters are the expensive ones to match, because anybody generating a lookalike spends the effort on a convincing prefix. A page that looks perfect and sits at the wrong address is the whole attack, and this comparison is the whole defence.
Nearly every phishing story starts the same way. A familiar address goes quiet, somebody goes looking, and the first plausible result wins. Saving the list while everything works means that moment never arrives. There is a short page on where to keep them and where not to.
Check whether any other onion service works. If nothing does, the problem is your own client and a full restart of Tor Browser fixes most of it. If other onions work and these three do not, it is the service, it usually clears within hours, and the correct response is to wait rather than to search.