ANAI peoples were included in clinical trials of the COVID-19 vaccine developed by Pfizer. But not at the same level as other Americans. In general, about 0.6% of Pfizer clinical trial participants were ANAI peoples, or around half the rate of overall population of ANAI people in the United States, which is 1.3%.
Supporting Links:
Variety across groups of participants in Pfizer sponsored clinical trials in the US (ScienceDirect, Contemporary Clinical Trials, accessed 12/25)
https://www.sciencedirect.com/science/article/pii/S1551714421001579
https://www.sciencedirect.com/science/article/pii/S1551714421001579