It is related to Nintendo Switch Online. We informed you about this this morning and now it seems that Nintendo has already provided a solution.
It was shared that we already have available new icons of Splatoon 3 and Mother 3, although the latter only in Japan
After this, some users outside of Japan changed their region to access the Mother 3 icons and this has caused a problem. When returning to the original region, users could encounter difficulties creating icons in their native region.
Although an official acknowledgment of the issue by Nintendo in America/Europe was not initially expected, a subsequent update has already resolved the situationallowing users to obtain Mother 3 icons from the Japanese Switch Online service without problems.
What do you think? We read you in the comments. You also have all the Nintendo Switch error codes and their solutions available on our website.