What was wrong with the Turing scheme? That was worldwide, not just the EU wasn’t it?
It was a bureaucratic nightmare compared with the tried and tested Erasmus scheme...
And it wasn't an 'all in one' package covering all aspects of an exchange program.
Ironically Erasmus+ was being introduced when the UK quit, and that addressed the problems Turing was supposed to change but couldn't...
Because a system with one country attempting to negotiate with many others as opposed to a bloc approach is far too unwieldy and bleeds finances - hence it's failure!
Edit.
Erasmus was not just the EU
Third countries associated to Erasmus
North Macedonia
Serbia
Iceland
Liechtenstein
Norway
Türkiye
The following countries can take part in certain Actions of the Programme, subject to specific criteria or conditions.
Western Balkans (Region 1)
Albania; Bosnia and Herzegovina; Kosovo ; Montenegro
Neighbourhood East (Region 2)
Armenia; Azerbaijan; Belarus ; Georgia ; Moldova; Ukraine
South-Mediterranean countries (Region 3)
Algeria; Egypt; Israel ; Jordan; Lebanon; Libya; Morocco; Palestine ; Syria; Tunisia
Russian Federation (Region 4)
Russia
Region 5 Asia
Bangladesh, Bhutan, Cambodia, China, DPR Korea, India, Indonesia, Laos, Malaysia, Maldives, Mongolia, Myanmar, Nepal, Pakistan, Philippines, Sri Lanka, Thailand, Vietnam
High income countries and territories
Brunei, Hong Kong, Japan, Republic of Korea, Macao, Singapore and Taiwan
Region 6 Central Asia
Afghanistan, Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, Uzbekistan
Region 7 Middle East
Iran, Iraq, Yemen
High income countries: Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, United Arab Emirates
Region 8 Pacific
Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, Niue, Palau, Papua New Guinea, Samoa, Solomon Islands, Timor-Leste, Tonga, Tuvalu, Vanuatu
High income countries: Australia, Cook Islands, New Zealand
Region 9 Sub-Saharan Africa
Angola, Benin, Botswana, Burkina Faso, Burundi, Cameroon, Cabo Verde, Central African Republic, Chad, Comoros, Congo, Congo - Democratic Republic of the, Côte d’Ivoire, Djibouti, Equatorial Guinea, Eritrea, Ethiopia, Eswatini, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Kenya, Lesotho, Liberia, Madagascar, Malawi, Mali, Mauritania, Mauritius, Mozambique, Namibia, Niger, Nigeria, Rwanda, Sao Tome and Principe, Senegal, Seychelles, Sierra Leone, Somalia, South Africa, South Sudan, Sudan, Tanzania, Togo, Uganda, Zambia, Zimbabwe.
Region 10 Latin America
Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Uruguay, Venezuela
Region 11 Caribbean
Antigua & Barbuda, Bahamas, Barbados, Belize, Cuba, Dominica, Dominican Republic, Grenada, Guyana, Haiti, Jamaica, St Kitts and Nevis, St Lucia, St Vincent & Grenadines, Suriname, Trinidad & Tobago
Region 12 US and Canada
United States of America, Canada
Region 13
Andorra, Monaco, San Marino, Vatican City State
Region 14
Faroe Islands, Switzerland, United Kingdom