Is it necessary to be discharged as a supplier on each platform?
Let's see, the roll of public tenders ... If you have a company and you are interested in catching contracts with the government or a public entity, you have to be registered as a supplier on the platforms where your sector really moves. It is not a matter of registering you on all the platforms that exist, which is not plan to go crazy. Better focus on those who really can give you opportunities, according to what you sell or the services you offer. That is, if your business is to build roads, then sign up in the places where these tenders are published, not in those of, what do I know, office material.
And be careful, that each public body can have its own system to register suppliers. The City Council of your city is not the same as the Ministry of Development, for example. So it's time to look at where you want to participate and what papers ask you. Sometimes it is a headache, yes, but it is time to go through the hoop: documents, comply with requirements, demonstrate that you do not owe anything to the Treasury or social security, and that you are not involved in popcutures crimes against the State. Come on, the basics for anyone to look straight.
By the way, if you want them to find you quickly on those platforms, the truquillo is in putting the keywords well. No generic descriptions. Put things like "tender", "public hiring", "service provider", and everything that sounds like yours. So when someone looks for what you do, you and not that of the competition.
In short, do not kill yourself by registering everywhere. Choose well, meet the requirements, put keywords in your profile and description, and you already have half a way to catch good bidding opportunities. Easy is not, but it is not space science either.