EEA right to work
EEA: European Economic Area
European Union (EU)
Iceland, Liechtenstein and Norway
Although these countries are not members of the EU, their nationals can work in the EU on the same footing as EU nationals, since they belong to the European Economic Area.
Iceland
https://www.government.is/topics/foreign-affairs/iceland-in-europe/european-economic-area/:
European Economic Area (EEA) – General Information
The Agreement on the European Economic Area (EEA) extends the Single Market of the EU to three out of the four EFTA countries, namely Iceland, Norway and Liechtenstein. Switzerland, while being a member of EFTA is not a party to the EEA, having voted against membership in December 1992. Within the EEA there is free movement of goods, services, capital and persons. Citizens of all 30 countries have the right to move freely throughout the EEA - to live, work, set up business, invest or buy real estate, with a few minor limitations in certain sectors.
Liechtenstein
Residing in Liechtenstein
With the exception of tourist visits not longer than 3 months, any stay in Liechtenstein requires a permit. Citizens of the European Economic Area (EEA) have the right to reside in Liechtenstein only subject to the quotas set out in a bilateral agreement.
EEA citizens
Half of the residence permits issued each year is allocated by a lottery; the other half is granted by the Government, either for the purpose of work to economically active persons (at least 56 per year)or for the purpose of residence without work to economically non- active persons (at least 16 per year).
The awarded residence permit in principle entails the right for a spouse and children under the age of 21 to reside in Liechtenstein as well.
Norway
https://www.udi.no/en/word-definitions/employers-employing-someone-who-is-an-eueea-national-/:
Employers: Employing someone who is an EU/EEA national
Instructions for employers seeking to hire a citizen of an EU/EEA country.
All EU/EEA nationals are allowed to work in Norway
All EU/EEA nationals have the right to work in Norway.
EU/EEA nationals can move to Norway and start working right away, but they must register with the police no later than three months after arriving in Norway. Registration is free.
Swedish, Danish, Icelandic and Finnish citizens can work in Norway without registering with the police, but they must notify the National Population Register (Folkeregisteret) of their move (external website).